Pulley-guard.



O. H. & A. F. PIEPER.

PULLEY GUARD.

APPLICATION FILED NOV. 12. 1911.

1 ,27 1,612. 7 Patented July 9, 1918.,

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Specification of iettersfatent.

Patented JuIyQ, 1918.

ofii iiial application fired May 27, 1912, Seria1N0, 699,9;3 8. Dividedaiid this application fired November 12, 1917. Serial No. 201,544.

To all whom it may concern Be it known that we, OSCAR H. PIEPER and ALPHoN'sE fF. P rm, bo'tli of Rochester,

in the county of Monroe and State of New York, have invented certain new and useful Improvements in Pulley-Guards; and we do hereby declare the following to be a full, clear, and exact description of the same, reference being had to the accompanying drawings, forming a part of this specification, and to the referencenumerals marked thereon.

The invention relates to pulley guards, more particularly of the type used in connection with small pulleys such as employed on dental engines and similar machinery. The particular object lies in the provision of a simple, economical and otherwise practical arrangement of guard, cooperative with a plurality of pulleys in stepped relationship, and readily adjustable into and out of operating position. To these and other ends the invention consists in certain improve ments and combinations of parts, all as will be hereinafter more fully described, the novel features being pointed out in the claims at the end of the specification.

\ In the drawings:

Figure 1 is an end elevation of a spindle provided with a plurality of pulleys and showing the application of the improved guard in operating position;

Fig. 2 is a similar view, with the spindle and pulleys removed, and illustrating the guard in its outermost or inoperative position;

Fig. 3 is a side elevation of the parts as appearing in Fig. 1, and

Fig. 4 is a similar View, with parts in section, and illustrating the guard in its outermost position.

Similar reference numerals in the several figures indicate the same parts.

This application is a division of an original application filed by us May 27, 1912, Serial No. 699,938. The embodiment herein illustrated comprises a rotary spindle 1, carrying a pair of stepped pulleys 2 and 3 which are fixed thereon. The spindle 1 rotates within a stationary bearing 4 which latter carries a collar 5, fixed to the hearing by means of a set screw 6.

The lard consists of a central portion 7 and aterally extenclin guard portions 8 and 9. The central portion 7 is in substah tial alinement with the collar 5, while the lateral guard portions 8 time are arranged to cooperate respectively with the pulleys 3and 2.

The guard portions 8 and 9 arepreferably in the form of flanges, of an integral piece ofsheet metal, and the entire guard is movable toward and from the pulleys. To this end, the collar 5 is provided with oppositely arranged guide openings 10, preferably extending entirely therethrough, and the guard carries a pair of pins 11 which are fixed upon the central portion 7, and are slidable in the openings 10. It is desirable to limit the outward movement of the guard, and to accomplish this, the pins 11 are cut away or recessed for a portion of their length, as indicated by 12, the length of such cut-away portions determining the amount of outward movement of the guard to its inoperative position. Arranged within the guide openings 10 are stops or projections 13 which extend into the recessed portions 12 and engage the ends of said recesses, as indicated in Fig. 2.

The structure described provides an exceedingly simple and practical device, and lends itself nicely to the character of adjustable guard required for fine dental apparatus.

We claim as our invention:

1. The combination with a rotatable spindle having a plurality of stepped pulleys thereon, of a bearing for the spindle, a collar fixed on the bearing, and a stepped guard cooperating with said pulleys and slidable on the collar transversely of the spindle axis.

2. The combination with a rotatable spindle having a pulley thereon, of a bearing for the spindle, a collar fixed on the bearing and having guide openings extending through opposite portions thereof, and a guard carrying oppositely arranged pins which are slidable in said openings.

3. The combination with a rotatable spindle having a plurality of stepped pulleys thereon, of a bearing for the spindle, a collar fixed on the bearing and having guide openings extending through-opposite portions thereof, and a stepped guard cooperating with said pulleys and carrying oppositely arranged pins which are slidable in said openings.

4. The combination with a rotatable spindle having a plurality of stepped pub leys thereon, of a bearing for the spindle, a collar fixed on the bearing and having guide openings extending through opposite portions thereof, a stepped guard cooperating with said pulleys and carrying oppositely arranged pins which are slidable in said openings, each of the pins having recessesv extending partially along one side, and limiting stops in the openings which engage said recesses and limit the outward movement of the guard.

5. The combination with a rotatable spindle having a plurality of stepped pulleys thereon, of a bearing for the spindle,

a collar fixed on the bearing and having guide openings extending through opposite portions thereof, a guard embodying a central outer portion carrying oppositely arranged pins which are slidable in the open ings, stepped guard portions cooperating with said'pulleys, the aforesaid pins having recesses extending partially along one side, and limiting stops in the openings which engage said recesses and limit the outward movement of the guard.

OSCAR H. PIEPER. ALPHONSE F. PIEPER.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents,

Washington, D. G. 

